Wilwood 1955–1957 Chevrolet passenger cars Front Hub Kit — Polished Dynalite, 12.19-inch SRP Drilled/Slotted

Polished calipers and drilled-and-slotted rotors give this Tri-Five hub kit its visible finish. For 1955–1957 Chevrolet passenger cars, Wilwood specifies polished 4-piston calipers and 12.19-inch SRP drilled-and-slotted rotors in this front package. Bill Wood founded Wilwood Engineering in 1977. From Camarillo, California, the company designs and manufactures disc brake systems and components including calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications. This kit should be matched to the hydraulic and mechanical requirements of the complete vehicle.

Package and installation requirements

• Included hubs offer 5 x 4.5 and 5 x 4.75-inch wheel bolt circles and 1/2-20 studs. Verify the intended wheel pattern and template clearance.
• The manufacturer specifies a +0.23-inch hub offset on each side. Account for that wheel-position change when checking tire, fender and suspension clearance on the Tri-Five Chevrolet.

Fitment & Compatibility

The Tri-Five Chevrolet application list covers Bel Air, Nomad, One-Fifty, Two-Ten and Sedan Delivery from 1955–1957, together with the listed 1957 Del Ray. Verify the original spindle before selecting the hub kit, especially on a car that has already received a disc conversion or suspension change. New hubs supply two wheel bolt-circle options and 1/2-20 studs; check that the intended wheels match the selected pattern. DS449 describes the bearing and hub assembly sequence and provides the clearance profile for the 12.19-inch rotor. The kit changes the hub and braking hardware but does not include replacement spindles, a booster or a master cylinder. Review those existing components as part of the finished conversion rather than treating the new calipers as a complete hydraulic system.

Review the fitment table and numbered notes below together; a matching model name alone does not establish the installation.

Technical Details

• Manufacturer part number: 140-7676-DP.
• Supplied hub wheel bolt circles: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm.
• Included wheel stud thread: 1/2-20.
• Rotor dimensions: 12.19 in; 309.63 mm diameter x 0.81 in; 20.57 mm thick.
• Rotor construction: Iron; vented; SRP Drilled & Slotted friction surface.
• Wheel-size guide: 15 in; 381 mm minimum nominal diameter; verify actual template clearance.
• Calipers: 4 pistons; forged aluminum; stainless steel pistons.
• Caliper attachment: lug mount; 1/8-27 NPT hydraulic inlet.
• Caliper finish: Polished aluminum.
• Sold as one kit. Mounting hardware is included. Replacement hubs are included.
• Brake pads are included; use the compound and installation instructions specified for this rotor package.
• Spindles, master cylinder, brake booster and hydraulic brake lines are not included.

Manufacturer references

• Wilwood product and configuration information
• Installation instructions

For help selecting the correct package, contact PMB Performance with the installed brake and mounting details. Our team has over 20 years of experience with brake components and fitment.

WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.

Vehicle Applications

Application Notes

1. Kit may fit some 15" wheels. Check wheel clearance diagram in kit installation instructions before purchase.
2. This kit supplies front service-brake components. No parking-brake mechanism or parking-brake cables are included; verify the vehicle's separate rear parking-brake system.
3. Line kit included (manufacturer): None
4. Front line-kit reference: 220-7699